On a VPS with above specs, mineserver runs like butter. The comparison with the official server is quite striking. I'd use mineserver for everything if it weren't for the fact that fire burns underwater.

Mac Mini PPC G4 1.25 GHz512 MB RAMrunning debian squeezea bit sluggish with one player but to be fair, the mini was running qbittorrent and firefox at the time.

and

Intel D410PT ( Atom double core 1.6 )2 Gb RAMDebian squeeze

run perfectly ( almost : " map.cpp: [map.cpp@734]: Loading chunk failed (getLight)" ) on this one ( alongside an official minecraft server ), but strangely it is perfect only on LAN play.( not a WAN issue since it play better with the official server )